NON-TRADITIONAL AMELIORANTS - Fertilizers: Components, Uses in Agriculture and Environmental Impacts - page 210

In this case, the bentonite clay has two functions: it is an ameliorant and forms on the
surface of the arable layer protective mulch layer. The exception is the reclamation of soils
contaminated by heavy metals; in this case, bentonite clay is needed to be quality stirred with
arable layer.
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